CN101094964B - Tool for excavating an object - Google Patents
Tool for excavating an object Download PDFInfo
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- CN101094964B CN101094964B CN2004800196793A CN200480019679A CN101094964B CN 101094964 B CN101094964 B CN 101094964B CN 2004800196793 A CN2004800196793 A CN 2004800196793A CN 200480019679 A CN200480019679 A CN 200480019679A CN 101094964 B CN101094964 B CN 101094964B
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Abstract
The tool comprising a jetting system having nozzle means arranged to receive a fluid and abrasive particles (23) via an abrasive particle inlet (4), and arranged to impinge the object to be excavated with a jetted stream of the fluid mixed with the abrasive particles, the tool further comprising a recirculation system arranged to recirculate at least some of the abrasive particles from a return stream, downstream impingement of the jetted stream with the object to be excavated, back to the jetting system via the abrasive particle inlet, the abrasive particle inlet having an entrance window whereby filtering means (43, 44) are provided in a path fluidly connecting said return stream with the entrance window, for keeping the abrasive particle inlet free from objects of the same size or larger than the size of the entrance window, which filtering means is passable for the abrasive particles.
Description
Technical field
This invention relates to the instrument that excavates object, and this instrument comprises the spraying system with jet element, and this jet element is configured to receive fluid and abrasive particle and impact the object that needs excavation with the fluid jet stream that is mixed with abrasive particle by abrasive particle inlet.
Background technology
Such class instrument can typically be arranged on the lower end of the drill string of working in subterranean bore hole.In operation process, fluid pumps into this instrument with the drilling fluid form from ground by the vertical passage on the drill string, and gets back to ground basically by the annular space between drill string and well bore wall in backflow.Circulate continuously by drill string and annular space for fear of abrasive particle, US 6510907 proposes to give recirculating system of this tool configuration, is used for abrasive particle and backflow are separated, and these particles are refilled spraying system.
Another kind of such instrument is described in international publication WO 02/34653.Recirculating system is based on a kind of helical separator magnet, and helical separator magnet is arranged in the support member with one heart.Support member is made of cylindrical sleeve, and the external surface of this sleeve constitutes a support surface.Magnetic particle is trapped on the support surface by the magnetic field that helical separator magnet produces.Separator magnet has a center longitudinal axis, and this separator magnet can be around this sleeve rotation relatively of this center longitudinal axis.
When separator magnet is driven when pivoting, magnetic particle is subjected to the mobile gradient perpendicular to the spiral fluted magnetic field intensity, and particle will move along this helicla flute.Like this, particle is sent back to spraying system on support surface, so that refill.
The instrument of this two classes prior art all relies on abrasive particle effectively to be transferred to spraying system from separator magnet.A large amount of abrasive particles are arranged must recycling the time in the unit interval, effectively passing on is particular importance, because in this case, the gathering of abrasive particle can make the abrasive particle inlet of spraying system get clogged.The gathering of abrasive particle strengthens because of its magnetic interaction.
In addition, the backflow that should therefrom separate of abrasive particle also contains excavation debris usually.These fragments can comprise the rock grain greater than the bands window of the abrasive particle inlet that enters spraying system.This class particle can block the abrasive particle inlet of spraying system, thereby hinders the process recycling of abrasive particle.
Summary of the invention
According to this invention, a kind of instrument that excavates object is provided, this instrument comprises the spraying system with jet element, and this jet element is arranged to receive fluid and abrasive particle through abrasive particle inlet, and is arranged to impact the object that need excavate with the fluid jet stream that is mixed with abrasive particle.This instrument also comprises recirculating system, and this recirculating system is arranged to make at least some abrasive particles to get back to spraying system from the backflow recycling in the downstream of the impact of the object that needs are excavated of injection stream by abrasive particle inlet.Abrasive particle inlet has the window of entering, therefore will reflux with enter the path that the window phase fluid is connected on filter element is set, this filter element can allow abrasive particle pass through.
Therefore, abrasive particle inlet is not had and enter window size bigger object identical or that compare, and abrasive particle can arrive abrasive particle inlet.
Filter element can be provided with one or more filter openings, the particle that window has identical projection size and shape that enters that filter opening is shaped as or is arranged to make filter element can not convey abrasive particle inlet passes through, and makes one or more filter openings can be by such particle total blockage simultaneously.Like this, even when such particle blocks one or more filter opening, still can by other the hole or pass a part of hole that does not get clogged and carry.
This point can be achieved like this, and promptly filter opening has sizable the ratio of width to height, so that filter opening size in one direction is confirmed as the window that enters less than abrasive particle inlet, and enters window greater than this on other direction.
The whole of filter opening can advantageously should be greater than the window area that enters of abrasive particle inlet by area, and are minimum thereby the adverse effect to abrasive particle recycling that filter element may be had is reduced to.
In an advantageous embodiments, wherein recirculating system comprises a support surface, and so that abrasive particle is guided to abrasive particle inlet, filter element is arranged to the form of skirt, forms the filter opening of form of slits between skirt and support surface.
Such skirt guided drilling fluid round support surface flows to abrasive particle inlet along support surface from bore hole annulus, thereby further provides support for making abrasive particle on the support surface be sent to abrasive particle inlet and enter spraying system.
Description of drawings
The present invention is described with example with reference to accompanying drawing, its schematic representation is in following figure:
Fig. 1 is the longitudinal section along the B-B line of a part of excavating the object instrument;
Fig. 2 is the view of the instrument of Fig. 1, and expression is with the filter element of skirt shape specific implementation;
Fig. 3 is the cross-sectional drawing by the A-A line of abrasive particle inlet and skirt;
Fig. 4 is the configuration of surface figure of the possible magnet surface configuration of instrument among Fig. 1; With
Fig. 5 (a-c part) is the alternative magnet configuration of using in the instrument.
In these figure, same section indicates identical mark.Wherein, in the following description, direction of rotation has been made regulation, each transmission direction is the direction of observation that is associated with the direction of rotation that is limited.
The specific embodiment
Fig. 1 with the longitudinal section schematic representation excavate the part of the instrument of object.Instrument can be connected with drill string (not shown) lower end, and this drill string extends in the well, and this well is formed in the object on stratum for example.This instrument is arranged to the stream that is mixed with abrasive particle is sprayed facing to the object that needs to excavate, and makes to the recycling of small part abrasive particle.
Instrument is provided with vertical drilling fluid passage 1, and the drilling fluid passage phase fluid that it is provided with on one end and drill string is communicated with, and it is communicated with the spraying system phase fluid with jet element 3,2,5 at its other end.Jet element 3,2,5 comprises a mixing chamber 2, and mixing chamber is connected with drilling fluid passage 1 by drilling fluid import 3.
Mixing chamber 2 also is communicated with abrasive particle inlet 4 phase fluids that abrasive particle enters, and is communicated with mixing nozzle 5 phase fluids with outlet (not shown).In the drilling process, this nozzle is configured to stream and abrasive particle are sprayed landing surface drilling tool in well.
Mixing chamber 2 is provided with a magnetic material 14, be contained in the opposite of abrasive particle inlet 4, but this is an option.
Mixing nozzle 5 is arranged to the fore-and-aft tilt towards drilling tool, becomes 15-30 ° angle of slope with vertical plane, but also can use other angle.Preferred angle of slope is about 21 °, and by denuding the bottom of well at the well axes inside to rotating entire tool, this angle is optimal.Mixing chamber 2 and mixing nozzle 5 align with equal angular with outlet nozzle, so that obtain optimal abrasive particle acceleration.
It is conical that support surface 15 is.Support surface also may be selected to be cylindrical.
Cylindrical separator magnet 7 constitutes than small magnet 7a, 7b, 7c and 7d by four that stack.Also can using of varying number than small magnet.Each magnet 7a, 7b, 7c and 7d have the antipodal N and the S utmost point, and these magnet are overlapping in this manner, promptly make the N-S direction of adjacent magnets around center longitudinal axis 8 azimuth that rotates relative to one another
, so that form two roughly spirality relative bands on diameter respectively by alternately changing N and the S utmost point.
For this illustrative purposes, magnetic pole is a district on the magnet surface or on the support surface, and the magnetic line of force passes magnet surface or support surface there, thereby regards coming the source region or entering the district of the magnetic line of force as.
Because the characteristic of bipolar magnet, each roughly arrange twist around than the N utmost point of small magnet 7a, 7b, 7c and 7d and the magnetic field intensity in the zone between the S utmost point less than the N utmost point and the S utmost point regional in magnetic field intensity.Like this, the hurricane band of the alternating N utmost point and the S utmost point forms a high-intensity magnetic field band that has the enhancing magnetic field intensity with respect to the zone that forms the low-intensity magnetic field band, and described low-intensity magnetic field band moves about 90 ° with respect to this high-intensity magnetic field band on the azimuth.Between strong, low-intensity magnetic field band, a gradient zones is arranged, be reduced to value in the low-intensity magnetic field band in this gradient zones magnetic field intensity from the value added in the high-intensity magnetic field band.
Separator magnet 7 has a center longitudinal axis 8, and with respect to sleeve 15 with around 8 rotations of center longitudinal axis.The driver part (not shown) is set with driving shaft 8, thereby makes separator magnet 7 rotation, according to the direction indication of hurricane band or turn clockwise or be rotated counterclockwise.Driving arrangement can be advantageously provided into the form of motor, and this motor can be controlled (not shown) by control system.
In the lower end of magnet 7d short taper profile section 11 is set.Sleeve 15 has been arranged in such a way the corresponding circle cone, so that the support surface 15 that abrasive particle inlet 4 is provided at around the conical section 11 is communicated with fluid between the mixing chamber 2.This cone is preferably based on the mixing chamber 2 discussed above angle identical with the angle of mixing nozzle 5.
Fig. 2 is the schematic diagram in this instrument outside.What can see is the ridge 41 that the taper support surface 15 of separator magnet 7 is housed and bypass drilling fluid passage is housed.The size that provides in size and the table 1 conforms to.
Table 1
| Component names | Mark | Size |
| The axial length of separator magnet | 7 | 120mm |
| The external diameter of separator magnet | 7 | 29mm |
| The basifacial diameter of |
15 | 34mm |
| The support surface |
15 | 52mm |
Near the abrasive particle inlet 4 zone (as shown in Figure 1) is by a cover shielding that is skirt 43 shapes.Leave the gap between skirt 43 and the support surface 15 to keep unlimited.By this gap, abrasive particle inlet 4 can enter through the path along support surface 15.The filter opening that is slit 44 shapes that moves towards process extension between skirt 43 and support surface 15 of this passage.
Fig. 3 represents the cross section along as shown in figs. 1 and 2 A-A.This cross section is through horizontal magnet 7d facing to axle 8, and process mixing chamber 2 and piece of magnetic material 14.This gap extends between skirt 43 and the support surface 15.Can enter this gap by slit 44.
It should be noted that Fig. 2 is suitable for using with the separator magnet that turns clockwise with the skirt on the instrument shown in 3 43.Obviously for the instrument with the eliminator that can be rotated counterclockwise, skirt must be arranged on the opposite side of abrasive particle inlet.
If install, the piece of magnetic material 14 on abrasive particle inlet 4 opposites sucks mixing chamber 2 with a part of magnetic field that separator magnet produces.As a result, for the magnetic particle 23 in the zone that enters abrasive particle inlet 4, the magnetic force that magnetic particle 23 is attracted to support surface 15 is so not strong.Therefore, magnetic abrasive grain enters mixing chamber 2 by abrasive particle inlet 4 and becomes and be more prone to.
In operation process, this tool works is as follows.This instrument is connected with the drill string lower end of inserting well from ground.Refer again to Fig. 1, stream is by a ground suitable pump (not shown) pumping, and drilling fluid passage and fluid passage 1 by drill string enter mixing chamber 2.In initial pump period, this stream is provided with low concentration magnetic material abrasive particle, for example shot or steel grit.
This stream flows into mixing nozzle 5 from mixing chamber 2, and sprays facing to borehole bottom.Simultaneously, drill string rotating makes borehole bottom by erosion equably.The backflow that contains fluid, abrasive particle and excavation debris is flowed towards the direction of getting back to ground through well from borehole bottom.Thereby, reflux and pass through along sleeve 15.
In the pumping stream, separator magnet 7 is pressed axle 8 rotations of the indicated direction of hurricane band direction around it, and the direction of hurricane band can be also can be counterclockwise clockwise.Separator magnet 7 causes a magnetic field that extends on sleeve 15 external surfaces and extend to outside sleeve 15 external surfaces.Along with this stream is passed through along sleeve 15, the abrasive particle in this stream is separated from this stream from the magnetic force of separator magnet 7, and this magnetic force is attracted to particle the external surface of sleeve 15.
Stream does not play the magnetic particle of corrasion now basically.Stream further flows to ground pump by well, and carries out recycling by drill string after removing drilling cuttings.
The magnetic force that is applied on the abrasive particle is low in the high-intensity magnetic field band in low-intensity magnetic field band internal ratio.Being trapped in magnetic particle on the support surface 15 attracted to and has being with of high-intensity magnetic field.Because of separator magnet 7 is rotated on the direction against the hurricane band direction, each band and the gradient zones between them apply power to magnetic particle on the direction vertical with gradient zones, this power has a downward component, thereby makes particle stressed to be attended by the downward motion of spirality.
When particles arrive abrasive particle inlet 4, the stream that flows into mixing chamber 2 is carried away these particles once more secretly.In case arrived the inside of mixing chamber 2, these particles just with through mixing chamber 2 interact from the stream that drilling fluid import 3 flows into mixing nozzles 5, thereby these particles are carried secretly in this stream.
In next one circulation, abrasive particle sprays facing to borehole bottom once more, then the annular space to flow through and to be formed by this instrument and well towards the direction on ground.Repeat this circulation then continuously.Like this, can realize that drill string/pumping equipment is not damaged by abrasive particle basically, because these abrasive particles only circulate by the bottom of drill string, drilling fluid then circulates by whole drill string and pumping equipment.In case the small part particle flows to ground by well, this a part of particle can be banished back by the fluid of the drill string of flowing through once more.
Jet pump mechanism in the mixing nozzle 5 produces one powerful stream, flows into mixing nozzle 5 from mixing chamber 2.The complementary support magnetic particle of jet pump mechanism flows into mixing chamber 2.(between import 3 and the mixing chamber 2) compares with the drilling fluid entry nozzle, mixing nozzle 5 cause fully carrying secretly away drilling fluid and the magnetic abrasive grain that enters mixing chamber by abrasive particle inlet 4 than major diameter.The drilling fluid and the interaction between the magnetic particle of being carried secretly also help particle is discharged into the mixing chamber 2 effectively from support surface 15.
Generally speaking, the skirt 43 that is provided with in order to form slit 44 plays the filter element effect, thereby slit 44 plays the filter opening effect.The inner surface of support surface 15 and skirt 43 limits the passage that abrasive particle inlet 4 is connected with bore hole annulus.Therefore skirt wall protection abrasive particle inlet 4 is avoided the annular space influence, so that abrasive particle inlet 4 can only allow the fluid from bore hole annulus enter through a path along support surface 15.
The setting of skirt has been avoided entering this passage greater than the rock grain of the bands window of abrasive particle inlet 4 (access window) size.The ratio of width to height of slit opening is bigger, radially (support surface laterally) go up slit opening less than abrasive particle inlet 4 enter window (entrance window), and along support surface circumferentially, slit opening is greater than entering window.Like this, if the part of slit is blocked by for example rock grain, then another part of this slit still can allow abrasive particle and fluid pass through.
This set of skirt 43 also guided drilling fluid flows to mixing chamber 2 from bore hole annulus along support surface 15 in the transmission direction of hope.For enough drilling fluids are carried secretly with flow of magnetic particles, the drilling fluid flow velocity in the bore hole annulus preferably should not surpass 3m/s.Selectively be that some additional grooves are set in the skirt wall on annular side.
The separator magnet 7 of band right hand helix direction (counterclockwise) represents that with a kind of representation wherein the face of cylinder flattens in paper in Fig. 4.Therefore, the vertical height of going up the expression separator magnet, separator magnet is divided into than small magnet 7a, 7b, 7c and 7d.The azimuthal surface of between 0 and 360 ° all can be seen in the horizontal direction.Just as seen, with regard to pile up each than with regard to the small magnet, angle in this example
Be 90 °,
Be that two adjacent orientation angles than between the N-S direction of projection in the small magnet are poor.Selectively, angle
Can change along magnet stack.
Depend on
With the axial height than small magnet, each in two high-intensity magnetic field bands all forms the direction of an angle θ and extends towards the perpendicular plane with the center longitudinal axis, as shown in Figure 4.Angle θ can be along the direction of magnet stack and is changed.
The magnetic particle that separated device magnet is trapped on the support surface trends towards they own magnetic circuits along the hithermost utmost point from a utmost point to opposite polarity are arranged in some long and narrow chains.Two adjacent N utmost points in a high-intensity magnetic field band of with dashed lines 9 expression and the shortest magnetic circuit on the roughly face of cylinder between the S utmost point position in Fig. 4 are than shorter across the shortest magnetic circuit on the roughly face of cylinder between the N utmost point (the S utmost point) position nearest in the S utmost point (or N utmost point) position and another high-intensity magnetic field band in this high-intensity magnetic field band.Therefore, magnetic particle will be often along forming a chain with the corresponding to line 9 of high-intensity magnetic field band.As a reference, the dotted line 10 that marks has the path length identical with dotted line 9, and as can be seen, this dotted line 10 is too short, so that the distance the hithermost S utmost point outside can not connecting from the N utmost point in the high-intensity magnetic field band to this band that strides across gradient zones 16.
Relevant distance is determined on support surface, because it is approximately the distance that particle chain will be grown up.
In each separator magnet 7 of Miao Shuing, high-intensity magnetic field band and low-intensity magnetic field band are owing to the Distribution of Magnetic Field of bipolar cylinder-shaped magnet forms in the above.This causes some to strengthen the magnetic field intensity band.If the changes of magnetic field in the gradient zones is big, the magnetic particle that is trapped on the support surface is the most directly made a response to the mobile of gradient zones.In order to realize this goal, the low-intensity magnetic field band is preferably corresponding to the magnetic conductivity district that reduces and/or the gap between separator magnet and support surface of magnet.Thus, can be implemented in steeper gradient zones between high-intensity magnetic field band and the low-intensity magnetic field band.
Fig. 5 represents also to do the setting of the alternative separator magnet that is rotated counterclockwise, and the magnet 7a among Fig. 1 is replaced by the magnet of twice to 7d, and each in the magnet of twice is those magnet 7a to half of 7d axial height.In addition, can use the magnet of varying number.Middle magnet is stacked in proper order by NNSSNN or SSNNSS, and all consecutive roots are on the hurricane band.Compare with the separator magnet 7 of Fig. 1, the combination of the adjacent N-N and the S-S utmost point is false spirality, and is consistent with the helix shape of band.In addition, in heap first with last separator magnet that constitutes than small magnet on magnetic pole, at the magnetic pole of stacking on the direction less than the separator magnet mid portion.This has such advantage, and promptly the magnetic circuit that top layer magnetic pole or bottom magnetic pole begin from the high-intensity magnetic field band can be found the magnetic pole of its nearest opposite polarity in same high-intensity magnetic field band.First that piles up is with last magnet even can have than the littler axial height of other magnet in piling up.
In the embodiment of Fig. 5, the magnetic conductivity district that reduces is arranged on the form of helical groove 26 on the external surface of separator magnet 7 of contiguous high-intensity magnetic field band.Because the magnetic conductivity of magnetic material is higher than the weak magnetic material (gas, fluid or solid) of filling these grooves, so the material that the inner magnet line of force mainly comprises in ferromagnetic material rather than the groove.This makes the high-intensity magnetic field band of magnetic field intensity of enhancing of adjacent recess 26 more outstanding.Fig. 5 a represents the cross section of separator magnet, and it shows the circular wheel profile 24 around just in time opposite magnetic pole, and the outline line 25 that just in time opposite magnetic pole is essentially straight line connects.The through ship profile is consistent with groove 26, and the circle contour line is consistent with the high-intensity magnetic field band of the magnetic field intensity of enhancing.
In Fig. 5 b, represented the simple vertically view of separator magnet, oblique line is represented the circle contour line and is essentially transition between the outline line of straight line.Fig. 5 c with Fig. 4 in same procedure the schematic representation method on whole surface is provided.The angle θ of helical groove is 53 °.
Preferably, with respect to the cylindrical peripheral of separator magnet, groove reaches a certain degree of depth.This degree of depth is similar to or greater than the distance in magnetic surface in the highfield and the gap between the support surface.
Obviously, the separator magnet that the work of representing in the Figure 4 and 5 is rotated counterclockwise also can be made into and turns clockwise, as long as change to the direction of hurricane band left-handed from dextrorotation.
Device and the suitable magnet described recirculating system of transmission magnetic material particle can be used any high magnetic material, comprises NdFeB, and SmCo and AlNiCo-5 or their combination are made.
Preferably, separator magnet also has and at room temperature is at least 140kJ/m3, is preferably at room temperature greater than 300kJ/m
3Magnetic energy content, for example be the magnet of NdFeB.High energy content allows the axial contact length of support surface and backflow shorter, therefore allows support surface that bigger tapering is arranged, and this is favourable to axial transfer rate.In addition, the rotation of separator magnet needs less power.
In the stratum, dig a well at the moment, the drilling fluid in the bore hole annulus (constituting) by well bore wall and excavating tools reflux can 2m/s or higher speed pass through recirculating system.The magnetic field that enters bore hole annulus should apply pulling force on particle.Before particle was by this device, big must being enough to of this pulling force pulled to support surface with them.Simultaneously, the magnetic force that particle is moved on the housing should be low as far as possible, so that drop to the frictional force and the power requirement of rotary separator magnet minimum.Only magnet is to have the radially magnet of polar moment coefficient of high as far as possible minimum master, and the main dipole nature that it has typically surpasses the magnet of four utmost point characteristics of a certain energy content.
In order to obtain the best capture efficiency of recirculating system, separator magnet preferably is positioned at the axial centre of well.In typical well, 15% the little axial dipole field that reaches the excavating tools diameter is acceptable.Be contained in the axial dipole field of the magnet of support surface 15 inside among the embodiment that shows among Fig. 2 vertically, for plan for being 10% or approximate 7mm the drilling well of 70mm diameter.
As the alternative of cylindrical separator magnet, the external diameter of separator magnet and the internal diameter of inwall 35 are reduced along with the reduction of axial height.What be used for assembling separator magnet can be in the form of a truncated cone than small magnet, to obtain cone separator magnet.Gap between the inwall of separator magnet and supporting sleeve also can dwindle, and the wall thickness of supporting sleeve also can dwindle.
In the mixing nozzle 5 or the abrasive material spout in the volumetric concentration of the drilling fluid magnetic abrasive grain that can comprise typically can reach 10%.The typical concentration of the magnetic abrasive grain that provides by bypass pipe 1 is by volume calculated and is 0.1-1%.Separator magnet typically is driven with the speed of 10-40Hz.
Above shown in filter element, especially the filter element that comprises skirt, generally can be applicable in the recirculating system of magnetic particle, except above-described recirculating system type, especially can be applicable to have the recirculating system that the separator magnet of other type is provided with, their some examples provide in WO 02/34653 and in US 6510907.
Just as explained above, the slit 44 that forms between skirt 43 and the support surface 15 has big the ratio of width to height, so the part of slit 44 still can keep unimpeded, even its another part is blocked by the rock grain.
Can select to be provided with some filter openings, each filter opening is less than the window that enters of inlet hole 4 at least in one direction, but spaced apart distance is greater than the size that enters window of inlet hole 4.
In any mode, the accumulation of one or more filter openings can should be greater than the area that enters window of abrasive particle inlet 4 by area.
Claims (7)
1. instrument that excavates object, this instrument comprises the spraying system with jet element, this jet element is arranged to receive fluid and abrasive particle through abrasive particle inlet, and be arranged to impact the object that will be excavated with the fluid jet stream that is mixed with abrasive particle, this instrument also comprises recirculating system, this recirculating system is arranged to make at least some abrasive particles from injection stream the backflow in the downstream of the impact of the object that will excavate to be got back to described spraying system by described abrasive particle inlet recycling, described abrasive particle inlet has the window of entering, it is characterized in that, filter element is set described backflow and this being entered on the path that the window phase fluid is connected, so that described abrasive particle inlet does not have and enters window size bigger object identical or that compare, this filter element can allow described abrasive particle pass through, wherein recirculating system comprises support surface, so that abrasive particle is guided to described abrasive particle inlet, described filter element is arranged to the form of skirt, forms the filter opening of form of slits between this skirt and this support surface.
2. according to the instrument of claim 1, wherein said filter element is provided with one or more filter openings, described filter opening is shaped as or is arranged to that described filter element can not be allowed and have with the described particle that enters identical projection size of window and shape of described abrasive particle inlet to pass through, and make one or more filter openings can be simultaneously by such particle total blockage, for this reason, at least one filter opening is provided with big relatively the ratio of width to height, this filter opening size in one direction is confirmed as the described window that enters less than described abrasive particle inlet, and on another direction greater than the described window that enters.
3. according to the instrument of claim 1 or 2, wherein said filter element is provided with many filter openings, each filter opening at least on transverse to a direction in described path less than the described window that enters of described abrasive particle inlet, and the distance that is spaced of continuous filter opening is greater than the described size that enters window of described abrasive particle inlet opening.
4. according to the instrument of claim 1 or 2, wherein said skirt is provided on the path of described support surface and guides fluid to enter described abrasive particle inlet from described backflow.
5. according to the instrument of front claim 1 or 2, wherein said recirculating system comprises transmitting device, and this transmitting device is used in the selected direction described abrasive particle being carried to described abrasive particle inlet, and described abrasive particle comprises magnetic material, and described transmitting device comprises:
-have the support member of described support surface, be used to support described abrasive particle, described support surface is extended on described selected direction;
-separator magnet, it is configured to produce and is used for described abrasive particle is remained on magnetic field on the described support surface, therefore high-intensity magnetic field band, low-intensity magnetic field band and magnetic field gradient are arranged to have in the magnetic field on described support surface, in the gradient zones of this magnetic field gradient between described high-intensity magnetic field band and low-intensity magnetic field band, therefore the magnetic field intensity in the described high-intensity magnetic field band is higher than the magnetic field intensity in the described low-intensity magnetic field band;
-parts that the relative in one direction described support surface of described high-intensity magnetic field band and low-intensity magnetic field band is advanced, a described direction has along the component of the direction of the magnetic field gradient on the support surface, and therefore described low-intensity magnetic field band is being followed described high-intensity magnetic field band.
6. according to the instrument of claim 5, wherein along described high-intensity magnetic field band, at least one first magnetic pole and opposite polarity second magnetic pole are set, so that first magnetic circuit on the described support surface from described first magnetic pole to described second magnetic pole, than on the described support surface across gradient zones to take office second magnetic circuit of its nearest opposite polarity magnetic pole what from described first magnetic pole short.
7. according to the instrument of claim 5, wherein gradient zones is arranged on around the described separator magnet by helical form.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03077159.6 | 2003-07-09 | ||
| EP03077159 | 2003-07-09 | ||
| EP04101505 | 2004-04-14 | ||
| EP04101505.8 | 2004-04-14 | ||
| PCT/EP2004/051404 WO2005005765A1 (en) | 2003-07-09 | 2004-07-08 | Tool for excavating an object |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101094964A CN101094964A (en) | 2007-12-26 |
| CN101094964B true CN101094964B (en) | 2011-07-06 |
Family
ID=34923961
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2004800196793A Expired - Fee Related CN101094964B (en) | 2003-07-09 | 2004-07-08 | Tool for excavating an object |
| CN2004800195362A Expired - Fee Related CN1833089B (en) | 2003-07-09 | 2004-07-08 | Device for transporting particles of a magnetic material and tool comprising such a device |
| CNB2004800196806A Expired - Fee Related CN100449108C (en) | 2003-07-09 | 2004-07-09 | Tool for excavating an object |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2004800195362A Expired - Fee Related CN1833089B (en) | 2003-07-09 | 2004-07-08 | Device for transporting particles of a magnetic material and tool comprising such a device |
| CNB2004800196806A Expired - Fee Related CN100449108C (en) | 2003-07-09 | 2004-07-09 | Tool for excavating an object |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN101094964B (en) |
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| AU2010334864B2 (en) * | 2009-12-23 | 2015-06-11 | Shell Internationale Research Maatschappij B.V. | Determining a property of a formation material |
| CN102686821B (en) * | 2009-12-23 | 2015-09-30 | 国际壳牌研究有限公司 | Boring method and jet flow drilling system |
| CN103041916B (en) * | 2013-01-23 | 2015-12-23 | 长沙矿冶研究院有限责任公司 | A kind of magnetic separator |
| CN104790452B (en) * | 2015-03-31 | 2017-03-22 | 三一重机有限公司 | Particle impact crushing system applied to excavator and crushing method of particle impact crushing system |
| CN105507885B (en) * | 2015-12-02 | 2019-04-02 | 中国地质大学（武汉） | A kind of permanent magnetism short joint |
| CN107304678A (en) * | 2016-04-24 | 2017-10-31 | 熵零技术逻辑工程院集团股份有限公司 | A kind of method for digging |
| CN108049814B (en) * | 2017-12-08 | 2019-04-30 | 长江大学 | A kind of drilling tool injecting simultaneously circulating particle |
| CN111764850B (en) * | 2020-06-22 | 2022-02-25 | 中国石油大学(北京) | Hollow ball filtering and separating device and drilling string |
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|---|---|---|---|---|
| US2779571A (en) * | 1954-04-09 | 1957-01-29 | Exxon Research Engineering Co | Pellet impact drill bit with controlled pellet return |
| US3375886A (en) * | 1963-09-24 | 1968-04-02 | Gulf Research Development Co | Method of treating abrasive-laden drilling liquid |
| US3416614A (en) * | 1965-12-27 | 1968-12-17 | Gulf Research Development Co | Hydraulic jet drilling method using ferrous abrasives |
| DE2052516A1 (en) * | 1970-10-26 | 1972-04-27 | Sellnow W | |
| US3831753A (en) * | 1972-12-18 | 1974-08-27 | Gulf Research Development Co | Slotted in-line screen |
| US6510907B1 (en) * | 1999-04-28 | 2003-01-28 | Shell Oil Company | Abrasive jet drilling assembly |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3489280A (en) * | 1966-02-03 | 1970-01-13 | Eriez Mfg Co | Magnetic separator having field shaping poles |
| JPS50125368A (en) * | 1974-03-22 | 1975-10-02 | ||
| DE2832037A1 (en) * | 1978-07-21 | 1980-01-31 | Canon Kk | Ferromagnetic material conveyor esp. for photocopying machine - has alternate spiral pole strips on core rotating in non-ferrous fixed tape |
| US4993503A (en) * | 1990-03-27 | 1991-02-19 | Electric Power Research Institute | Horizontal boring apparatus and method |
| US5170891A (en) * | 1991-09-20 | 1992-12-15 | Venturedyne Limited | Self-cleaning magnetic separator |
| US6702940B2 (en) * | 2000-10-26 | 2004-03-09 | Shell Oil Company | Device for transporting particles of magnetic material |
-
2004
- 2004-07-08 CN CN2004800196793A patent/CN101094964B/en not_active Expired - Fee Related
- 2004-07-08 CN CN2004800195362A patent/CN1833089B/en not_active Expired - Fee Related
- 2004-07-09 CN CNB2004800196806A patent/CN100449108C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2779571A (en) * | 1954-04-09 | 1957-01-29 | Exxon Research Engineering Co | Pellet impact drill bit with controlled pellet return |
| US3375886A (en) * | 1963-09-24 | 1968-04-02 | Gulf Research Development Co | Method of treating abrasive-laden drilling liquid |
| US3416614A (en) * | 1965-12-27 | 1968-12-17 | Gulf Research Development Co | Hydraulic jet drilling method using ferrous abrasives |
| DE2052516A1 (en) * | 1970-10-26 | 1972-04-27 | Sellnow W | |
| US3831753A (en) * | 1972-12-18 | 1974-08-27 | Gulf Research Development Co | Slotted in-line screen |
| US6510907B1 (en) * | 1999-04-28 | 2003-01-28 | Shell Oil Company | Abrasive jet drilling assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101094964A (en) | 2007-12-26 |
| CN1833089B (en) | 2011-09-14 |
| CN100449108C (en) | 2009-01-07 |
| CN1820119A (en) | 2006-08-16 |
| CN1833089A (en) | 2006-09-13 |
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